Dental floss holder



FIG. 1 is a perspective view showing a rear surface and bottom end of a dental floss holder showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top end view thereof;

FIG. 5 is a bottom end view thereof; and,

FIG. 6 is a side view thereof, the opposite side view being a mirror image.

The broken lines are for environmental purposes only and form no part of the claimed design. 

The ornamental design for a dental floss holder, substantially as shown and described. 